[Java] [Singleton Factory]
The singleton pattern by itself is useful but it is reallypowerful is in combining it with other patterns. Let’s assume thatwe design an application for the production of different types ofchocolate bars (Wonka Bar, Oompaloompa Bar, etc.). Each type ofchocolate bar has a unique ID. This unique ID is printed on theinside of the chocolate bar wrapper. Customers can check this IDonline on and win a visit to the chocolate factory. Chocolate barsare being mass produced using multiple threads and a problem occurswhen the factory is instantiated twice in 2 different threads as itis possible to have 2
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